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各类汞柱流出问题是高中热学部分的难题,它需要学生具有较强的综合分析能力和运用数学知识能力.在不少教辅书中,往往换一道题目,就会换一种解法,且常常突出数学计算而缺少物理意义的解析,令人费解.笔者从力学角度分析汞柱受力平衡条件结合气体状态分析,给出解决汞柱流出问题一种统一解法.1玻璃管倒置后汞柱流出问题图1例1.一根长为L的均匀直玻璃管,开口向上,管内有一段长为h的汞柱封闭了一段长为l
All kinds of mercury outflow problem is part of the high school heat problem, which requires students to have a strong ability to comprehensive analysis and use of mathematical knowledge.In many supplementary books, often for a title, it will be a solution, and Often highlighting the mathematical calculation of the lack of physical meaning of the interpretation is puzzling.The author from the mechanics point of view of mercury stress equilibrium conditions combined with gas state analysis to solve the problem of mercury outflow a unified solution.1 after the inverted glass tube mercury column Outflow problem Figure 1 Example 1. A uniform length of L straight glass tube, the opening up, the tube has a length of h of mercury to close a length of l